Exploratopia

From chapters.ca:
From physics to forensics, from the largest clouds to the tiniest ants, from Issac Newton to elephant dung, "Exploratopia" overflows with things readers can explore using the simplest, everyday items, such as eggs, paper clips, soda bottles, vinegar, and plastic cups. Kids will love these innovative activities and will have fun learning all at the same time.

Science on the Loose: Amazing Activities and Science Facts You'll NEver Believe by Helaine Becker

From the back of the book:
Have you ever wondered where dimples come from? What would happen if you fell into a black hole? or why you can't walk through a wall? These are just a few of the curious questions that are given scientific answers in this high-energy book. Bursting with original, hand-on science activities and jaw-dropping information about the world around us, Science on the Loose puts a whole new spin on scientific discovery for kids.

Science Experiments You can Eat by Vicki Cobb, illustrated by David Cain

From chapters.ca:
Published more than 20 years ago, Cobb's classic has been revised and updated to reflect advances in scientific knowledge and the invention of the microwave. There are lots of new experiments as well as all the old favourites. Black-and-white illustrations throughout. Ever wonder what makes popcorn pop? Why cakes rise? How jelly gels? Your kitchen will be transformed into a laboratory worthy of a mad scientist as you make startling discoveries about how cabbage can detect acid, how bacteria makes yogurt, and how decomposed sugar turns to caramel. Then after a long day at the lab you can relax and eat your results: soup, biscuits, pretzels, cupcakes, or cookies.

Vicki Cobb’s seminal book has been revised and updated to encompass advances in modern technology but still provides what all kids want: a legitimate excuse to play with their food!

Magic Mud by Dr. Zed

This is my favourite of the Dr. Zed science experiment books, but I would recommend any of them. They are fun and easy to do with younger children. Older children can try them on their own, with friends, or with the family.